The "Cool for the Summer" singer turned 23 years on Thursday, and celebrated with an adorable new puppy. She introduced the all-black dog -- whom she appropriate dubbed 'Batman' -- to her over 21 million followers on Instagram yesterday.

"This has been the most painful week of my life but because Wilmer and I had so much love and support, I've been able to stay strong and will continue to get through this difficult time," she Instagrammed alongside a collage of her and Buddy. "The out pour of love and support has been unbelievable and it means the world to us."

But even if Batman is really cute, she actually got another birthday gift that actually brought her to tears -- singer Kelly Clarkson covering her summer jam, "Cool for the Summer."

"If someone would've told me when I when I was little that one day @kellyclarkson would one day cover one of MY songs at HER concert for MY BIRTHDAY, I would call you crazy and never believe you again," she Instagrammed. Well last night THE QUEEN DID and she has no idea what it means to me. Honestly the coolest Bday gift EVER!!!!!!"